Game chat in Fortnite is not working, what should I do?

Can someone help me?

If I want to go in and play with Fortnite, I can't hear them in the Fortnite game chat. My friends play on the XBox and I play on the PS4. You can't hear me and I can't hear you.

I had the same problem and it worked for me that I went into the settings and the game chat just once disabled and reactivated. But I did that on pc and I do not know if it works on ps4 too